XSS in Cern Rucio
CVE-2026-25136
Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. A reflected Cross-site Scripting vulnerability was located in versions prior to 35.8.3, 38.5.4, and 39.3.1 in the rendering of the ExceptionMessage of the WebUI 500 error which could allow attackers to steal login session tokens of users who navigate to a specially crafted URL. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Cern Rucio
- Rucio — versions < 35.8.3, >= 36.0.0rc1, < 38.5.4, >= 39.0.0rc1, < 39.3.1
Weakness classification (CWE)
References
- github.com/rucio/rucio/security/advisories/GHSA-h79m-5jjm-jm4q (Exploit, Vendor Advisory)
- cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sh… (Not Applicable)
- github.com/rucio/rucio/releases/tag/35.8.3 (Product, Release Notes)
- github.com/rucio/rucio/releases/tag/38.5.4 (Product, Release Notes)
- github.com/rucio/rucio/releases/tag/39.3.1 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-25136?
- CVE-2026-25136 is a high-severity vulnerability in Cern Rucio, classified under Cross-site Scripting. CVSS score: 8.1/10. Published 2026-02-25.
- How severe is CVE-2026-25136?
- High severity. CVSS v3 base score is 8.1 out of 10.